Question

Which of the following statements is most likely true concerning the given reaction?
2A(g) + B(g) → 2C(g) + D(s)

• A. Entropy of system is decreasing
• B. Entropy of system is increasing
• C. The reaction is spontaneous
• D. The reaction is non-spontaneous

Hint:

A decrease in the number of gas molecules usually indicates a decrease in system entropy.

Answer 1

The Correct Option is A

The reaction shows a decrease in the number of gaseous moles: 3 moles of gases react to give 2 moles of gas and 1 solid. Since solids have much lower entropy than gases, the overall entropy decreases.